Improvement in roofs



PATENT OFFICE.

NELSON G. NORTHUP, OF BLOOMINGTON, MINNESOTA.

IMPROVEMENT IN ROOFS.

Specification forming part of Letters Patent No. 117,104, dated July 18,1871.

To all whom t may concern.:

Be it known that I, NELSON G. NORTHUP, of Bloomington, in the county ofHennepin and State of Minnesota, have invented a new and Improved Roof 5and I do hereby declare that the following is a full, clear, and exactdescription of the saine, reference being had to the accompanyingdrawing forming a part of this speciiication.

My invention consists in an improvement for making the joints of a roofwater-tight, as hereinafter fully described and subsequently pointed outin the claim.

Figure l represents the top view of a roof, and Figs. 2 and 3 sectionalviews.

C are therooiboards. H are sheet-metal plates with which theymay becovered. G are long 4 sheetqnetal caps, bent over until they-assume theshape of the letter T and present a central and two side flanges. Theshank enters the joint between the boards or plates and'is clampedtherein, while the arms are made to overlap on each side and shed thewater from the joint. A capjoint break like this will thus have ampleopportunity to contract and expand, according to temperature, withoutthe joint being injuriously affected thereby.

Having thus described my invention and al1 that is necessary to a fullunderstanding thereof, what 1 esteem to be new, and desire to protect byLetters Patent, is-

The long metal caps G, constructed With a central and two side iian gesto adapt it to be inserted into the joint oi' the rooting-plates orboards and to overlap on both sides, as and for the purpose specified.

ANELSON G. N ORTHUP.

Vitnesses:

UnARLEs W. DAILEY, GEORGIA A. OLIN.

